US3615836A
Expired / Lapsed
US
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Fuel cell containing and a process of making an activated fuel cell catalyst
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1967-06-01
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Granted: 1971-10-26
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Expires: 1987-06-01
Abstract
Abstract A catalyst selected from the group consisting of noble metals, transition metals, lanthanide series metals, mixtures and alloys thereof, which have limited activity because of absorbed halide ions, may be employed in electrodes of a fuel cell containing a halide ion free acid electrolyte provided that, prior to its operation in the fuel cell, the catalyst has been treated with a basic solution having a pH in the range of 8 to 14 for a period of time sufficient to desorb the halide ions.
Inventors
- 👤 John S Batzold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/08; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/36; B01J23/38; B01J23/40; B01J23/42; B01J23/46; B01J23/462; B01J23/468; B01J23/48; B01J23/52; B01J23/54; B01J23/56; B01J23/64; B01J23/648; B01J23/6482; B01J23/652; B01J23/6527; B01J23/656; B01J23/6567; B01J23/66; B01J23/68; B01J23/688; B01J23/70; B01J23/74; B01J23/755; B01J23/89; B01J23/892; B01J23/90; B01J27/00; B01J37/00; H01M4/00; H01M4/86; H01M4/90; B01J21/00; B01J21/18; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
23 words
A method as in claim 1 in which said noble metal is selected from the group consisting of platinum, ruthenium, iridium and rhenium.
Claim 2
Dependent Claim
20 words
A method as in claim 1 wherein the basic solution has a pH in the range of 10 to 14.
Claim 3
Dependent Claim
18 words
A method as in claim 3 wherein the basic solution is a solution of an alkali metal hydroxide.
Claim 4
Dependent Claim
108 words
A fuel cell containing an anode, a cathode, and a halide-ion-free mineral acid electrolyte, at least one of said anode or cathode being a halide-free catalytic electrode comprising a support and a finely divided catalyst produced by a method which comprises: a. chemically reducing at least one noble catalyst metal halide salt to the corresponding metal or lower metal oxide in finely divided form, the reduced catalyst having absorbed therein halide ions; and b. treating the resulting finely divided reduced catalyst with a basic solution having a pH of at least 8 for a period of time sufficient to desorb the halide ion and to activate said catalyst.
Claim 5
Dependent Claim
23 words
A fuel cell as in claim 5 wherein the acid electrolyte is selected from the group consisting of sulfuric acid and phosphoric acid.
Claim 6
Dependent Claim
21 words
A fuel cell as in claim 6 wherein the basic solution has a pH in the range of 10 to 14.
Claim 7
Dependent Claim
19 words
A fuel cell as in claim 7 wherein the basic solution is a solution of an alkali metAl hydroxide.
Claim 8
Independent Claim
123 words
A method of preparing a finely divided halide-free fuel cell catalyst and incorporating an electrode containing same into a fuel cell which comprises: a. chemically reducing at least one noble catalyst metal halide salt to the corresponding metal or lower metal oxide in finely divided form, the reduced catalyst having absorbed thereon halide ions; b. forming said catalyst into an electrode; c. treating the electrode containing said finely divided reduced catalyst with a basic solution having a pH of at least 8 for a period of time sufficient to desorb the halide ion and to activate said catalyst; d. incorporating said electrode into the fuel cell containing a halide ion free mineral acid electrolyte; and e. using said fuel cell to generate electricity.
Claim 9
Dependent Claim
21 words
A method according to claim 9 in which said electrode is formed by incorporating said catalyst into a conductive metal screen.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |